*The molar extinction coefficient is reported to be either 4500<cite>Skoneczny-BiochemJ-2000>/cite> or 4900<cite>Onishi-ApplEnvironMicrobiol-1995</cite> (not original references, better references would be preferable).

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*The molar extinction coefficient is reported to be either 4500 M<sup>-1</sup>cm<sup>-1</sup> <cite>Skoneczny-BiochemJ-2000</cite> or 4900 M<sup>-1</sup>cm<sup>-1</sup> <cite>Onishi-ApplEnvironMicrobiol-1995</cite> (not original references, better references would be preferable).